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2 / 24 page ZLED7030 High Current 40V LED Driver with Switch Dimming © 2011 Zentrum Mikroelektronik Dresden AG — Rev. 1.2 All rights reserved. The material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. The information furnished in this publication is subject to changes without notice. Vin I SENSE LX GND ZLED7x30 D1 LED String Vs = 8.5 to 40 VDC (C3) Rs L1 33 to 220 H C2 0.1 F DIM1 DIM2 GND/Floating GND/Floating Switch C1 ≥220 F Brief Description The ZLED7x30 continuous-mode inductive step- down converter family is one of our ZLED LED- control ICs. It is designed for applications requiring high brightness and high current. The ZLED7x30 can efficiently drive a single LED or multiple series-connected LEDs from a voltage input higher than the LED forward voltage (Vin = 8.5 to 40VDC). It provides an adjustable output current (1.2A maximum), which is set via an external resistor and controlled by the ZLED7x30’s integrated high-side output current-sensing circuit and high speed internal 40V power switch. Its low conducting impedance ensures high system effi- ciency. The ZLED7x30 provides a switch dimming func- tion. It detects external switch action to adjust out- put current, allowing dimming functionality to be achieved without changing the original lighting sys- tem circuitry. The switch dimming is implemented in either two- level mode or three-level mode. The output current of every level and the total number of levels are customer selected by setting the corresponding input conditions of DIM1 and DIM2 pin. The ZLED7x30 enables diverse industrial and consumer lighting applications requiring high driving currents, wide operating voltage range, high efficiency, and variable brightness control. It offers over-temperature and LED open-circuit protection. The ZLED7x30 can also minimize bill- of-material costs because very few external components are required for most applications. Only a resistor, a diode, an inductor, and three capacitors are needed for a typical basic application. ZLED7x30 Typical Application Circuit Features • Switch dimming with multiple levels • Three modes for output level settings • Up to 1.2A output current • Internal 40V power switch • Wide DC input voltage range 8.5 to 40 VDC • Output current accuracy: 5% (typical) • LED open-circuit protection • Thermal shutdown protection Benefits • High efficiency: up to 98% • Very few external components needed for operation • Adds switch dimming function to existing installation Available Support • Evaluation Kit Physical Characteristics • Operating temperature: -40°C to 105°C • Switching frequency: up to 1MHz • SOP-8 package ZLED7x30 Family Selection Matrix Product Max. Current Output Package ZLED7030 1.2A SOP-8 ZLED7330 1.0A SOP-8 ZLED7530 0.75A SOP-8 ZLED7730 0.35A SOP-8 For additional information on our ZLED driver family, visit www.zmdi.com/products/led-drivers/ |
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